CN111436054B

CN111436054B - Control information transmission method and device

Info

Publication number: CN111436054B
Application number: CN201910028189.8A
Authority: CN
Inventors: 吴霁; 刘建琴; 张佳胤
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2022-05-24
Anticipated expiration: 2039-01-11
Also published as: BR112021013695A2; EP3910988A1; US20210337416A1; WO2020143827A1; CN111436054A; US11902814B2; EP3910988A4

Abstract

The embodiment of the application provides a transmission method of control information. The method comprises the following steps: user Equipment (UE) sends report information to a base station, wherein the report information comprises the detection result of one or more downlink reference signals of the UE or the state of a timer/counter corresponding to one or more downlink reference signals; the UE receives feedback information from the base station, wherein the feedback information comprises the sending state information of the one or more downlink reference signals. By the method provided by the embodiment of the application, the UE can acquire a more accurate RLM result, and unnecessary reconnection is avoided, so that the energy consumption of the UE is reduced, and the system resource overhead is saved.

Description

Control information transmission method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting control information.

Background

In the LTE system, a User Equipment (UE) may continuously monitor a downlink reference signal (CSI-RS) configured for the UE by a base station, for example, a channel state information-reference signal (CSI-RS). The UE utilizes the downlink reference signal to estimate the link state between the UE and the base station. When the Reference Signal Received Power (RSRP) and/or the reference signal quality (RSRQ) of the downlink reference signal received by the UE is lower than a threshold, the link between the base station and the UE is considered to be failed. The UE subsequently needs to re-perform the random access procedure to establish a connection with the base station.

Fig. 1 is a schematic diagram of a radio link detection process in an LTE system. A Radio Link Monitoring (RLM) procedure in the LTE system includes the following procedures. And when the UE continuously monitors that the RSRP/RSRQ of the N310 CSI-RSs is lower than the threshold value, starting a timer T310. If the RSRP/RSRQ of N311 continuous CSI-RS signals is higher than the threshold value before the timer T310 is expired, the wireless link between the UE and the base station is considered to be recovered; otherwise, the wireless link is considered to be failed, and the base station and the UE need to be reconnected. Wherein, N310 and N311 are counters or values corresponding to the counters. N310 may take 200 milliseconds (ms) and N311 may take 100 ms. T310 is a timer. In some cases, T310 may also indicate the value to which the timer corresponds. T310 may be on the order of 1 second.

The RLM procedure in the 5G system is similar to that in the LTE system. Further, the 5G system supports unlicensed band (unlicensed band) communication. The device working in the unlicensed frequency band can automatically detect whether the channel is idle without authorization. When the device detects that the channel is idle, the device can access the channel to work. In order to ensure coexistence with other devices operating in unlicensed frequency bands, the device adopts a Listen Before Talk (LBT) channel contention access mechanism. Due to LBT limitation, both the periodically configured CSI-RS and SS/PBCH block cannot be guaranteed to be transmitted in the preset time-frequency resource, and the RLM process may not work normally.

Disclosure of Invention

The embodiment of the application provides a transmission method of control information. By the method described in the embodiment of the present application, the UE can know a more accurate RLM result.

In a first aspect, an embodiment of the present application provides a method for transmitting control information. The method comprises the following steps: user Equipment (UE) sends report information to a base station, wherein the report information comprises the detection result of one or more downlink reference signals of the UE or the state of a timer/counter corresponding to one or more downlink reference signals; the UE receives feedback information from the base station, wherein the feedback information comprises the sending state information of the one or more downlink reference signals.

By the method provided by the embodiment of the application, the UE can acquire a more accurate RLM result, and unnecessary reconnection is avoided, so that the energy consumption of the UE is reduced, and the system resource overhead is saved.

In one possible design, when the UE does not detect at least one downlink reference signal or energy of at least one detected downlink reference signal is lower than a threshold value, the UE sends the report information to the base station.

In one possible design, the reporting information may be characterized in bitmap form or 1-bit information.

In one possible design, the 1-bit information is used to indicate whether the UE has a downlink reference signal that is not correctly received, or whether a timer/counter corresponding to the one or more downlink reference signals is started.

In one possible design, the transmission status information of the one or more downlink reference signals may include that at least one of the one or more downlink reference signals is not transmitted due to LBT failure.

In one possible design, the method further includes: and the UE updates the timer/counter corresponding to the one or more downlink reference signals.

The UE can perform more accurate timing/counting and perform communication according to the timing/counting result. That is, the UE may utilize more accurate RLM results to avoid unnecessary reconnection.

In one possible design, the method further includes: and the UE receives configuration information from the base station, wherein the configuration information carries parameters used for updating timers/counters corresponding to one or more downlink reference signals.

Different services have different requirements on delay. Thus, the UE may be configured with timer/counter parameters for different services. The UE can more accurately time/count in different traffic scenarios.

In addition, reference signals configured by UEs in different groups are affected by LBT to different degrees, so RLM parameters of UEs in different groups should also be configured differently to compensate different reference signals to different degrees.

In a second aspect, an embodiment of the present application provides a method for transmitting control information. The method comprises the following steps: a base station receives reporting information from User Equipment (UE), wherein the reporting information comprises a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals; and the base station sends feedback information to the UE, wherein the feedback information comprises the sending state information of the one or more downlink reference signals.

In one possible design, the base station receives reporting information from the UE when the UE does not detect at least one downlink reference signal or when energy of at least one detected downlink reference signal is below a threshold value.

In one possible design, the method further includes: and the base station sends configuration information to the UE, wherein the configuration information carries parameters used for updating timers/counters corresponding to one or more downlink reference signals.

In a third aspect, an embodiment of the present application provides an apparatus for transmitting control information. The device includes: a sending module, configured to send report information to a base station, where the report information includes a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals; a receiving module, configured to receive feedback information from the base station, where the feedback information includes transmission status information of the one or more downlink reference signals.

In a possible design, when the UE does not detect at least one downlink reference signal or energy of at least one detected downlink reference signal is lower than a threshold, the sending module sends the report information to the base station.

In one possible design, the apparatus further includes: and the processing module is used for updating the timer/counter corresponding to the one or more downlink reference signals.

In one possible design, the receiving module is further configured to receive configuration information from the base station, where the configuration information carries parameters used to update timers/counters corresponding to one or more downlink reference signals.

In a fourth aspect, an embodiment of the present application provides a device for transmitting control information. The device includes: a receiving module, configured to receive report information from a user equipment UE, where the report information includes a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals; a sending module, configured to send feedback information to the UE, where the feedback information includes sending state information of the one or more downlink reference signals.

In one possible design, the receiving module receives the report information from the UE when the UE does not detect at least one downlink reference signal or when the energy of at least one detected downlink reference signal is lower than a threshold value.

In one possible design, the reported information may be characterized in bitmap form or 1-bit information.

In one possible design, the 1-bit information is used to indicate whether the UE has a downlink reference signal that is not correctly received, or to indicate whether a timer/counter corresponding to the one or more downlink reference signals is started.

In a possible design, the sending module is further configured to send configuration information to the UE, where the configuration information carries parameters used to update timers/counters corresponding to one or more downlink reference signals.

In a fifth aspect, a device for transmitting control information is provided, where the device includes means for performing the method of the first aspect or any possible implementation manner of the first aspect, or means for performing the method of the second aspect or any possible implementation manner of the second aspect.

In a sixth aspect, a communication device is provided, which may be a base station or a UE designed in the method, or a chip disposed in the base station or the UE. The communication device includes: a processor, coupled to the memory, may be configured to execute the instructions in the memory to implement the method performed by the first node in the first aspect and any one of the possible implementations. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

When the communication device is a base station or a UE, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip provided in a base station or a UE, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In a seventh aspect, an embodiment of the present application provides a communication system, including: a base station and a UE. The UE is configured to perform the method provided by the first aspect or any design of the first aspect. The base station is configured to perform the method provided by the second aspect or any design of the second aspect.

In an eighth aspect, an embodiment of the present application provides a chip, where the chip is connected to a memory, and is configured to read and execute a software program stored in the memory, so as to implement the method provided in any one or any one of the first aspect to the second aspect.

In a ninth aspect, the present application provides a chip, where the chip includes a processor and a memory, and the processor is configured to read a software program stored in the memory to implement the method provided in any one of the first aspect to the second aspect or any one of the designs of any one of the first aspect to the second aspect.

In a tenth aspect, this embodiment of the present application further provides a computer-readable storage medium for storing computer software instructions for executing the functions designed in any one of the first to third aspects or any one of the first to third aspects, which contains a program designed for executing any one of the first to second aspects or any one of the first to second aspects.

In an eleventh aspect, embodiments of the present application provide a computer program product comprising instructions, which when run on a computer, cause the computer to perform the method of the first aspect described above or any one of the first to second aspects described above.

Drawings

Fig. 1 is a schematic diagram of a radio link detection process in an LTE system;

FIG. 2 is a schematic diagram of a communication system;

FIG. 3 is a schematic diagram of an RLM method provided herein;

FIGS. 4a-4f are schematic flow diagrams of an RLM provided herein;

FIG. 5 is a schematic diagram of resource allocation for transmitting report information;

fig. 6 is a schematic diagram of a device 600 for transmitting control information according to an embodiment of the present application;

fig. 7 is a schematic diagram of a device 700 for transmitting control information according to an embodiment of the present application;

fig. 8 is a schematic diagram of a communication device 800 according to an embodiment of the present disclosure.

Detailed Description

The embodiment of the application can be applied to a communication system, such as a wireless communication system. As long as the presentity in the communication system needs to indicate or send the Channel Occupancy Time (COT) format, the method provided in the embodiments of the present application may be applied. Specifically, the communication system includes, but is not limited to, a Long Term Evolution (LTE) system, a long term evolution-advanced (LTE-a) system, a New Radio (NR) system, and a 5G (5G) (5 a) system^thgeneration) system, and the like, may also include systems such as a wireless fidelity (WiFi) system, a worldwide interoperability for microwave access (wimax) system, and the like.

Fig. 2 is a schematic diagram of a communication system. As shown in fig. 2, the communication system includes a Base Station (BS) and terminals 1 to 6. In this communication system, terminals 1 to 6 can transmit uplink data to the base station. The base station receives uplink data transmitted from terminals 1 to 6. Further, the terminals 4 to 6 may constitute one sub-communication system. In the communication system, the BS may transmit downlink data to the terminal 1, the terminal 2, the terminal 5, and the like. The terminal 5 may also transmit downlink data to the terminals 4 and 6. The BS can receive uplink data of terminal 1, terminal 2, terminal 5, and the like. Terminal 5 may receive uplink data of terminals 4 and 6.

The base station may be a base station (e.g., a Node B or an eNB) in a 2G, 3G or LTE system, a new radio controller (NR controller), a gNode B (gNB) in a 5G system, a centralized network element (centralized unit), a new radio base station, a radio remote module, a micro base station, a distributed network element (distributed unit), a Transmission Reception Point (TRP) or a Transmission Point (TP), or any other radio access device, which is not limited in this embodiment of the present application.

A terminal may be a device having functionality to communicate with base stations and relay nodes, or may be a device that provides voice and/or data connectivity to users. For example, the terminal may be a handheld device, a vehicle-mounted device, or the like having a wireless connection function. Common terminals include, for example: the mobile phone includes a mobile phone, a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), and a wearable device such as a smart watch, a smart bracelet, a pedometer, and the like. A terminal may also be referred to as a User Equipment (UE).

Due to the rapid development of wireless communication technology, spectrum resources are increasingly in short supply, and the exploration of unauthorized frequency bands is promoted. 3GPP introduced Licensed Assisted Access (LAA) and enhanced licensed Assisted Access (eLAA) technologies. Namely, the Non-independent (Non-persistent) deployment LTE/LTE-A system on the unlicensed spectrum, and the unlicensed spectrum resources are maximally utilized by the assistance of the licensed spectrum.

Communication systems deployed over unlicensed spectrum typically employ a competing approach to use or share radio resources. Generally, a transmitting end first listens to an unlicensed channel (or unlicensed spectrum) for a vacant channel before transmitting a signal. For example, the transmitting end determines its busy-idle state by detecting the power of the received signal over the unlicensed spectrum. If the power of the received signal is less than a certain threshold, the unlicensed spectrum is considered to be in an idle state. The transmitting end may transmit signals over the unlicensed spectrum, otherwise no signals are transmitted. This Listen-Before-send mechanism is called Listen-Before-send (LBT).

At present, there are two main types of LBT methods, namely CAT4LBT (also called type1channel access procedure) and CAT2LBT (also called type2channel access procedure). For CAT2LBT, a device may access the channel after listening for 25us of idle channel. For CAT4LBT, however, devices need to access the channel by means of random backoff. Specifically, the device selects a corresponding random backoff number according to the channel access priority (channel access priority) to perform backoff, and accesses the channel after confirming that the channel is idle. The device can obtain the corresponding Maximum Channel Occupancy Time (MCOT).

After occupying the channel, the base station may occupy the channel for downlink transmission within a period of time, and may also schedule the UE associated with the base station for uplink transmission. The size of the Channel Occupancy Time (COT) of the base station is related to the priority of LBT performed by the base station. The lower the priority, the longer the time that can be taken after the channel is preempted. The maximum channel occupancy time may be 10 ms. The base station may notify the UE of the start time of the COT and/or the COT duration by a downlink identification signal (downlink identification signal), a request to send/clear to send (RTS/CTS) signaling, a group-common physical downlink control channel (group-common PDCCH), and the like.

The base station may configure the UE with periodic reference signals for radio link monitoring (which may be referred to as RLM RS). The reference signal may be a CSI-RS or an SSB, and a Discovery Reference Signal (DRS). In a 5G system, the periodically configured reference signals may not be transmitted due to failure of the base station LBT. Due to LBT limitation, both CSI-RS and SS/PBCH block which are periodically configured by NR-U cannot be guaranteed to be transmitted in a preset time-frequency resource, and the RLM mechanism of the UE when reference signal transmission is affected by LBT is provided. The RLM counter/timer (N310/T310) may be updated semi-statically/dynamically by the methods provided herein. The UE may report the RLM measurement result. The base station may transmit RLM RS status information.

Fig. 3 is a schematic diagram of an RLM method provided in the present application. As shown in fig. 3, the method includes the following steps.

Step 301: and the UE sends reporting information to the base station, wherein the reporting information comprises the RLM state of the UE.

The RLM state of the UE includes a detection result of the downlink reference signal or a state of a timer/counter corresponding to the downlink reference signal.

When the UE does not detect the downlink reference signal or the energy of the detected reference signal is lower than the threshold, the UE may send the report information to the base station. The reported information informs the base station of the detection result of the downlink reference signal. For example, the UE notifies the base station of the number of downlink reference signals that are not correctly detected or which downlink reference signals are not correctly detected by using the report information.

The UE may start a relevant timer or counter when the downlink reference signal is not correctly detected. Therefore, the UE can process the report information to inform the base station of the state of the timer/counter corresponding to the downlink reference signal. In this way, the base station may also know that the UE fails to correctly detect one or more downlink reference signals.

The downlink reference signal may be an RLM RS. For example, the downlink reference signal may be CSI-RS, SSB, or DRS.

The reported information can be represented in a bitmap form or can be 1bit information. The UE may use the bitmap to inform the base station which downlink reference signals are not correctly detected. Alternatively, the UE may use the 1-bit information to inform the base station that there is an RLM RS that is not received correctly or that the base station T310 has been started.

The reported information may also carry the number of incorrectly received RLM RSs.

Before sending the reporting information, the base station may configure uplink resources for the UE. And the UE sends the reporting information on the configured uplink resources.

Step 302: the UE receives feedback information from the base station, wherein the feedback information comprises the sending state information of one or more downlink reference signals.

The base station informs the UE of which downlink reference signals are not transmitted due to LBT failure through feedback information. The base station may feed back the transmission states of the N310 downlink reference signals. If the base station always feeds back the sending state of the downlink reference signals at least in the detection window corresponding to the N310, the UE may use 1bit to notify the base station that at least one reference signal is not correctly received.

The feedback information may also be characterized in a bitmap.

Optionally, step 303: the UE updates the RLM status.

Specifically, the UE updates a timer and/or a counter corresponding to the downlink reference signal. For example, the UE resets or updates N310, T310, or N311. Optionally, resetting the timer or counter means clearing the timer or counter.

Optionally, step 304: the UE receives configuration information from the base station. The configuration information carries information for updating the RLM timer/counter. The RLM timer/counter may be N310/T310. The configuration information may be a parameter. The UE may adjust the value of the RLM timer/counter using this parameter.

It is understood that step 304 may exist independently of steps 301-303. That is, the base station and the UE may perform step 304 separately. In addition, step 304 may be performed before or during steps 301-303 without limitation. Different services have different requirements on delay. Thus, the UE may be configured with timer/counter parameters for different services. The UE can more accurately time/count in different traffic scenarios. In addition, reference signals configured by UEs in different groups are affected by LBT to different degrees, so RLM parameters of UEs in different groups should also be configured differently to compensate different reference signals to different degrees.

Example one

The base station configures the UE with a periodic reference signal for radio link monitoring. In a 5G system, the periodically configured reference signals may not be transmitted due to failure of the base station LBT. Fig. 4a-4f are schematic diagrams of an RLM process according to the present application. As shown in fig. 4a, the base station fails to transmit a reference signal on resource 1, resource 2, resource 3, and resource 4 due to LBT failure.

The preset threshold of N310 configured by the base station to the UE is set to 4 (of course, the preset threshold may be any positive integer, and the initial value of N310 is 0), and the transmission period of the configured RLM RS is 20 ms. Thus, N310 corresponds to a duration (or detection window) of 80 ms. The UE detects RSRP at every 20ms of resources used to transmit RLM RSs. When RSRP (or its corresponding PDCCH demodulation probability) is below a threshold, timer N310 is started immediately. When the UE detects that the energy of the reference signal is lower than the threshold value in a resource location, the value of N310 is increased by 1. When the UE detects that the energy of the reference signal is lower than the threshold value in 4 consecutive resource locations, the UE starts a timer T310. That is, when the value of N310 reaches a preset threshold (e.g., 4), T310 is initiated.

The UE may report the RLM monitoring result (or the reception conditions of several previous RLM RSs) to the base station. For example, if the UE does not receive the RLM RS on 4 consecutive resources, the result is reported to the base station. Alternatively, the UE may report the result in the form of a bitmap (bitmap). For example, the UE tells the base station that none of the 4 RLM RSs were received correctly in the form of a bitmap of '0000'. Or the UE notifies the base station N310 of the number of RLM RSs that are not received (or not correctly received or not detected) in a corresponding detection window (e.g. 80ms) or a time period including the detection window (for example, the number of RSRPs detected at resources 1-4 by the UE, which are carried by the reporting information of the UE in fig. 4a, is less than the threshold is 4). The UE may report the RLM monitoring result to the base station at any time after starting N310 or after starting T310.

After receiving the result reported by the UE, the base station feeds back the sending state of the RLM RS to the UE. The base station can also feed back to the UE in the form of a bitmap, and the transmission state of the RLM RS can be obtained. For example, '0100' means that only the 2 nd of 4 RLM RSs is successfully transmitted, and the remaining 3 are not transmitted due to LBT failure. Or send '1' to the UE to indicate that only 1 RLM RS was successfully transmitted. For example the feedback information in fig. 4a carries a number 0 or carries '0000'.

Optionally, the base station may feed back, to the UE, the transmission status of one or more RLM RSs before the base station transmits the feedback information, or the base station may feed back, to the UE, the transmission status of one or more RLM RSs before the base station receives the report information of the UE. For example, the feedback information in fig. 4a carries '0000' or '00001'.

The UE knows, after receiving the information fed back by the base station, that the one or more RLM RSs are not correctly received due to poor link quality, but are not correctly transmitted due to failure of the base station LBT. The UE may reset or update the counter and/or timer at this point based on the information.

For example, when the UE detects that the RSRP of the first RLM RS is lower than the threshold, the UE starts the counter N310 (in this case, the counter N310 is equal to 1). As in resource 1 of fig. 4a, N310 of the UE is 1. When the RSRP of the subsequent consecutive 3 RLM RSs are all below the threshold value, the counter N310-4 reaches its preset threshold value. At this time, the UE starts a timer T310 and a counter N311, and sends reporting information at an uplink resource configured for the UE by the base station. The UE may continue the RLM procedure until the base station feedback is received. That is, T310/N311 does not pause. For example, N311 equals 1 at resource 5 in fig. 4 a. When the UE receives the feedback information from the base station (the sending status of the RLM RS fed back by the base station), the UE resets or updates N310 and/or N311 and/or T310.

As shown in fig. 4a, the base station informs the UE that it has not transmitted the RLM RS due to LBT failure at resource 1, resource 2, resource 3, and resource 4. If the UE does not receive RLM RS because the RLM RS was not sent due to LBT failure, N310 should not be started or should not be incremented. Thus, T310 should also not be started. Therefore, the UE resets T310 and/or N311 upon receiving the feedback information of the base station. Further, when the UE detects that RSRP of the RLM RS is less than a threshold before receiving the feedback information of the base station, N310 is started; otherwise, N310 is not enabled. If the UE detects that the RSRP of the RLM RS is greater than or equal to the threshold value at resource 5 in fig. 4a, the UE resets T310 and N311, and does not start N310. In fig. 4b, the UE detects that RSRP of RLM RS is less than the threshold at resource 5, and then the UE resets T310 and N311, and starts N310.

As shown in fig. 4c, the base station informs the UE through feedback information that it has not transmitted the RLM RS due to LBT failure at resource 1, resource 3, and resource 4. Since the UE successfully monitors the RLM RS at resource 5, N311 of the UE at resource 5 is 1. The UE resets T310, N311, and N310 after receiving the feedback information. At this time, the link between the UE and the base station may be considered normal.

As shown in fig. 4d, the base station informs the UE through feedback information that it has not transmitted the RLM RS due to LBT failure at resource 1, resource 3, and resource 4. Since the UE fails to successfully monitor the RLM RS at resource 5, the UE resets T310 and N311 upon receiving the feedback information. And updates N310 to 2. At this time, it can be considered that N310 of the UE starts to be recounted from 2. The UE may subsequently repeat the above steps, which is not described herein again.

Further, the resource for sending the report information may or may not correspond to the time-frequency resource for RLM RS transmission. When the two are in one-to-one correspondence, each RLM RS has 1 corresponding uplink resource for the UE to send the reporting information. The uplink resource is earlier in time than the transmission time preset by the next RLM RS. When the two are not in one-to-one correspondence, the UE may not send the report information when the N310 fails or the T310 starts. And the UE continues to monitor the radio link according to the RLM mechanism and sends reporting information through one or more pre-configured uplink resources when the N310 and/or the N311 and/or the T310 is started. The base station may configure uplink resources for the UE in a static (indicated by RMSI/OSI/RRC signaling)/semi-static (indicated by RMSI/OSI/RRC signaling)/dynamic (indicated by DCI) manner in advance. The uplink resource may be dedicated to sending the reporting information (for example, the uplink resource may be a PRACH) or may be used to carry other information besides the reporting information (for example, the uplink resource may be a PUCCH).

As shown in fig. 4e, after the detection position of each 2 RLM RSs, an uplink resource for the UE to send the report information is configured. Receiving the feedback information after resource 3, the UE will update N310. When the feedback information carries the information of the RLM RS transmission status at resources 1-3, the UE knows that the base station has 2 RLM RSs that have not been successfully transmitted due to LBT failure. The UE updates the value of N310 to 1. When the feedback information carries the information of the RLM RS transmission status at resource 1-2, the UE knows that the base station has 1 RLM RS that has not been successfully transmitted due to LBT failure. The UE updates the value of N310 to 2.

As shown in fig. 4f, the UE does not detect the RLM RS between sending the reporting information and receiving the feedback information. After receiving the feedback information, the UE resets T310 and updates N310. When the feedback information carries the information of the RLM RS transmission status at resource 1, resource 3, and resource 4, the UE knows that the base station has 3 RLM RSs that have not been successfully transmitted due to LBT failure. The UE updates the value of N310 to 1. The value of N310 for the UE at resource 5 is 2.

Alternatively, the UE may only use 1bit of reported information to inform the base station of its RLM status. For example, the base station UE is informed that the current RLM status is T310 has been started. The base station may inform the UE of the transmission status of the plurality of RLMs by Downlink Control Information (DCI) or Radio Resource Control (RRC) signaling. In this case, the number of the plurality of RLM RSs may be defined by a standard or may be dynamically changed. When the RLM RS detection numbers and/or periods configured by different UEs are different, the base station may notify the corresponding number of RLM RS transmission statuses for the different UEs.

Further, one UE may inform the base station of the result of its RLM and the number of RLM RS transmission statuses requesting the base station to feed back using more than 1bit of information in its reporting information. And the base station sends the sending states of the plurality of RLM RSs to the UE according to the received reported information.

Optionally, the number of RLM RS transmission states issued by the base station is consistent with the number of RLM RSs configured by the UE in the detection window corresponding to N310 or N311.

The UE may send the report information to the base station through an uplink channel such as a Physical Uplink Control Channel (PUCCH), a Scheduling Request (SR), or a Physical Random Access Channel (PRACH); the base station can also transmit the report information to the uplink resource periodically configured by the UE; the reporting information can also be sent through authorized resources. Multiple UEs may report in an orthogonal manner. Fig. 5 is a schematic diagram of resource allocation for transmitting report information. As shown in fig. 5, different UEs may configure different resource element sets (interlaces) in the RACH resource and/or different symbols to simultaneously transmit respective reporting information. The resource unit set may use Resource Block (RB) as a unit, or the base station may determine from which UE the received report information comes according to the time-frequency position of the received report information and an additional orthogonal code (for example, preamble, orthogonal code to further improve the maximum number of UEs supporting simultaneous transmission of the report information) by using sub-RB as a unit.

The RLM RS transmission status fed back by the base station may be carried in a common message. For example, it may be carried in Remaining Minimum System Information (RMSI) or group-common PDCCH.

After the UE sends the report information to the base station, the UE may continuously monitor possible feedback sent by the base station within a preset time window. The time window length may be specified by a standard, or may be configured by the base station and signaled to the UE through RMSI, RRC, or the like. The UE does not receive the base station feedback within the specified time window and then performs RLM according to the previous procedure, e.g., does not perform N310/T310 timer update.

Further, when the UE still does not receive the base station feedback before the T310 fails or does not detect that the consecutive N311 RLM RSs are higher than the threshold, the previous radio link is considered to be failed. At this time, the UE receives a system message (e.g., RMSI) of the base station, and initiates random access to re-attempt to establish a connection with the base station on the designated uplink resource. The method can also be used for the UE to perform information interaction with the base station when the timer T310 is about to expire and the base station reconnection is to be performed. For example, when the UE still does not receive the feedback from the base station before the T310 fails or does not detect that the consecutive N311 RLM RSs are higher than the preset threshold, the UE considers that the radio link between the UE and the base station fails. The UE receives the system message of the base station, and initiates random access on the designated uplink resource to retry establishing connection with the base station.

The first embodiment provides an interaction mechanism between the UE and the base station, which reduces the impact of LBT on the RLM mechanism and makes the UE perform RLM more accurately.

Example two

In the 5G system, N310 may be configured flexibly by the base station based on parameters such as data type. For example: configured through RMSI periods, or configured through RRC dynamically or semi-statically. The base station may decide how to configure N310. For example, the base station may perform configuration after the N RLM RSs are unsuccessfully transmitted, or may periodically (e.g., 1s) refresh the configuration.

For eMBB services, the RLM RS period may be 10ms and the N310 duration may be 100 ms.

For voice services, the RLM RS period may be 10ms and the N310 duration may be 50 ms.

In the unauthorized communication scenario, the transmission of RLM RS is affected by LBT, which varies with time depending on the surrounding interference. The base station may configure additional parameters in RMSI/RRC to the UE to indicate its updated N310/T310 parameters. The value of this additional parameter may be implemented by the base station and is not specified in the standard. It should be noted that the base station may configure different parameters for different UEs/different grouped UEs.

For different UEs working in different frequency bands or different partial Bandwidths (BWPs), the frequency bands or BWPs are subject to different external interferences, which results in different sending success probabilities of RLM RSs configured for different UEs, and different RLM parameters need to be configured for different UEs in order to avoid frequent reconnection attempts due to failure of RLM for a UE. For example:

the base station indicates to the UE that the additional parameter is 0.8, then for the eMBB service, the N310 counter duration of the UE becomes 100/0.8-125 ms. The base station may also indicate that the additional duration of the N310 timer is 25ms, and the updated duration of the N310 timer is 100+ 25-125 ms.

Similarly, the base station may also update/modify the T310 or other RLM RS related timers by the same method, which is not described herein again.

When the additional parameters configured for each UE are the same, the base station may be carried in RMSI, OSI or group-common PDCCH. When the additional parameters configured by each UE are different, the base station may configure each group/each UE separately through RRC signaling, may instruct through scheduling DCI corresponding to each group/each group of UEs, or may instruct in a group-common PDCCH. The group-common PDCCH may contain a plurality of information elements, each of which contains a UE/UE packet identity (e.g. C-RNTI of the UE, RNTI of the UE packet) and corresponding additional parameters. The additional parameter may also be an offset based on the original timer.

The second embodiment provides a method for updating the RLM related timer/counter at the UE side by the base station through additional parameters, so that the timer/counter of the UE is more flexible and more adaptive to the change of the environment.

By the method provided by the embodiment of the application, the RLM counter (N310/N311) can be updated semi-statically/dynamically. And the sending influence of LBT on the RLM RS is considered, so that the RLM-RS measurement window is set more reasonably. Furthermore, the UE feeds back the RLM measurement result and the base station sends the RLM RS state indication, so that the RLM RS measurement is more accurate.

The method for determining the radio link state by the UE through the RLM RS in the embodiment of the present application may also be used for performing Radio Resource Management (RRM) measurement by the UE. The base station configures RRM-RS for RRM measurement through the method of the embodiment, and the UE reports the RRM-RS according to the configuration of the base station and the measurement result of the UE.

The transmission method according to the embodiment of the present application is described in detail above with reference to fig. 1 to 5. Based on the same inventive concept, a transmission apparatus according to an embodiment of the present application will be described below with reference to fig. 6 to 8. It should be understood that the technical features described in the method embodiments are equally applicable to the following apparatus embodiments.

Fig. 6 shows a schematic block diagram of a transmission apparatus 600 of control information according to an embodiment of the present application. The apparatus 600 is configured to perform the method performed by the base station in the foregoing method embodiment. Alternatively, the specific form of the apparatus 600 may be a base station or a chip in the base station. The embodiments of the present application do not limit this. The apparatus 600 includes the following modules.

A receiving module 610, configured to receive reporting information from a user equipment UE, where the reporting information includes a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals;

a sending module 620, configured to send feedback information to the UE, where the feedback information includes sending status information of the one or more downlink reference signals.

In one possible design, the receiving module 610 receives the report information from the UE when the UE does not detect at least one downlink reference signal or energy of at least one detected downlink reference signal is lower than a threshold value.

In one possible design, the sending module 620 is further configured to send, to the UE, configuration information that carries a parameter for updating a timer/counter corresponding to one or more downlink reference signals.

Further, the apparatus 600 may also include a processing module. The processing module is used for processing the received data and processing the data to be transmitted.

Fig. 7 shows a schematic block diagram of a transmission apparatus 700 of control information according to an embodiment of the present application. The apparatus 700 is configured to perform the method performed by the second device in the method embodiments. Alternatively, the specific form of the apparatus 700 may be a UE or a chip in the UE. The embodiments of the present application do not limit this. The apparatus 700 includes the following modules.

A sending module 710, configured to send report information to a base station, where the report information includes a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals;

a receiving module 720, configured to receive feedback information from the base station, where the feedback information includes transmission status information of the one or more downlink reference signals.

In a possible design, when the UE does not detect at least one downlink reference signal or energy of at least one detected downlink reference signal is lower than a threshold value, the sending module 710 sends the report information to the base station.

In one possible design, the apparatus 700 further includes: the processing module 730 is configured to update the timer/counter corresponding to the one or more downlink reference signals.

In one possible design, the receiving module 720 is further configured to receive configuration information from the base station, where the configuration information carries parameters for updating timers/counters corresponding to one or more downlink reference signals.

Further, the processing module 730 is further configured to process the received data and process the data to be transmitted, and the transmitting module is configured to transmit the data.

Based on the same inventive concept, the embodiment of the present application further provides a communication device 800. Please refer to fig. 8, which shows a schematic structural diagram of a base station or a UE involved in the above method embodiment. The apparatus 800 may include: a transceiver 801. The transceiver 801 may further include a receiver and a transmitter.

The transceiver 801 is configured to send or receive report information. The transceiver 801 may also be used to receive or transmit feedback information. The reported information comprises the detection result of one or more downlink reference signals of the UE or the state of a timer/counter corresponding to one or more downlink reference signals; the feedback information includes transmission status information of the one or more downlink reference signals.

It should be understood that in some embodiments, the transceiver 801 may be integrated by a transmitter and a receiver. In other embodiments, the transmitter and receiver may be independent of each other.

Further, the apparatus 800 may also include a processor 802, a memory 803, and a communication unit 804. The transceiver 801, the processor 802, the memory 803, and the communication unit 804 are connected by a bus.

On the downlink, data to be transmitted (e.g., PDSCH) or signaling (e.g., PDCCH) is passed through the transceiver 801 to condition the output samples and generate a downlink signal, which is transmitted via the antenna to the terminals in the above-described embodiments. On the uplink, the antenna receives the uplink signal transmitted by the terminal in the above-described embodiment, and the transceiver 801 conditions the signal received from the antenna and provides input samples. Traffic data and signaling messages are processed, e.g., modulated for data to be transmitted, SC-FDMA symbol generation, etc., in processor 802. These elements are handled according to the radio access technology employed by the radio access network (e.g., the access technology of LTE, 5G, and other evolved systems).

The processor 802 is further configured to control and manage the apparatus 800 to perform the processing performed by the base station or the UE in the above method embodiments. In particular, the processor 802 is configured to process received information as well as to process information to be transmitted. As an example, the processor 802 is configured to enable the apparatus 800 to perform the processing procedure of the apparatus 800 involved in fig. 2 to 5. In an unauthorized scenario, the processor 802 further needs to control the apparatus 800 to perform channel sensing for data or signaling transmission. Illustratively, the processor 802 performs channel sensing with signals received by the transceiver 801 from a transceiver device or antenna and controls the transmission of signals via the antenna to preempt the channel. In various embodiments, processor 802 may include one or more processors, such as one or more Central Processing Units (CPUs), processor 802 may be integrated into a chip, or may be the chip itself.

The memory 803 is used for storing relevant instructions and data, as well as program codes and data for the apparatus 800. In various embodiments, Memory 603 includes, but is not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), Erasable Programmable Read-Only Memory (EPROM), or portable Read-Only Memory (CD-ROM). In this embodiment, the memory 803 is separate from the processor 802. In other embodiments, the memory 803 may also be integrated into the processor 802.

It should be noted that the apparatus 800 shown in fig. 8 may be configured to perform the method performed by the base station or the UE in the foregoing method embodiment, and for implementation and technical effects thereof that are not described in detail in the apparatus 800 shown in fig. 8, reference may be made to the related description of the foregoing method embodiment.

It is to be understood that fig. 8 only shows a simplified design of a base station or UE. In various embodiments, a base station or UE may include any number of transmitters, receivers, processors, memories, etc., and all base stations or UEs that may implement the present application are within the scope of the present application.

One embodiment of the present application provides a communication system. The communication system includes a base station or UE. The base station may be the communication device shown in fig. 6 or the device shown in fig. 8. The UE may be the communication device shown in fig. 7 or the device shown in fig. 8.

Based on the same inventive concept, the embodiment of the present application further provides a computer program product, where the computer program product includes: computer program code which, when run on a computer, causes the computer to perform the method in the embodiment shown in fig. 2 to 5.

Based on the same inventive concept, the present application also provides a computer-readable medium, which stores program code, and when the program code runs on a computer, the computer is caused to execute the method in the embodiments shown in fig. 2 to 5.

Based on the same inventive concept, the embodiment of the application also provides a chip. The chip may be a processor for implementing the method in the above method embodiments. Further, the chip is connected to a memory for reading and executing the software program stored in the memory to implement the method in the embodiment shown in fig. 2 to 5.

Based on the same inventive concept, the present application provides a chip, where the chip includes a processor and a memory, and the processor is configured to read a software program stored in the memory to implement the method in the embodiments shown in fig. 2 to 5.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Claims

1. A method for transmitting control information, the method comprising:

user Equipment (UE) sends report information to a base station, wherein the report information comprises the detection result of one or more downlink reference signals of the UE or the state of a timer/counter corresponding to one or more downlink reference signals; the detection result of the one or more downlink reference signals is used for informing the base station of the number of downlink reference signals which are not correctly detected by the UE or the downlink reference signals which are not correctly detected by the UE; the resources used for sending the report information correspond to the time-frequency resources used for transmitting the one or more downlink reference signals one to one;

the UE receives feedback information from the base station, wherein the feedback information comprises the sending state information of the one or more downlink reference signals.

2. The method of claim 1, wherein the UE sends the report information to the base station when the UE does not detect at least one downlink reference signal or when energy of at least one detected downlink reference signal is lower than a threshold value.

3. The method according to claim 1 or 2, characterized in that the reporting information can be characterized in bitmap form or 1-bit information.

4. The method of claim 3, wherein the 1-bit information is used to indicate whether the UE has a downlink reference signal that is not correctly received or whether a timer/counter corresponding to the one or more downlink reference signals is started.

5. The method of any one of claims 1 to 4, wherein the transmission status information of the one or more downlink reference signals comprises that at least one of the one or more downlink reference signals is not transmitted due to LBT failure.

6. The method according to any one of claims 1 to 5, further comprising:

and the UE updates the timer/counter corresponding to the one or more downlink reference signals.

7. The method according to any one of claims 1 to 6, further comprising:

and the UE receives configuration information from the base station, wherein the configuration information carries parameters used for updating timers/counters corresponding to one or more downlink reference signals.

8. A method for transmitting control information, the method comprising:

a base station receives reporting information from User Equipment (UE), wherein the reporting information comprises a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals; the detection result of the one or more downlink reference signals is used for informing the base station of the number of downlink reference signals which are not correctly detected by the UE or the downlink reference signals which are not correctly detected by the UE; wherein, the resource for receiving the reported information is in one-to-one correspondence with the time frequency resource for transmitting the one or more downlink reference signals;

and the base station sends feedback information to the UE, wherein the feedback information comprises the sending state information of the one or more downlink reference signals.

9. The method of claim 8, wherein the base station receives the reporting information from the UE when the UE does not detect at least one downlink reference signal or when energy of at least one detected downlink reference signal is lower than a threshold value.

10. The method according to claim 8 or 9, wherein the reporting information can be characterized in bitmap form or 1-bit information.

11. The method of claim 10, wherein the 1-bit information is used to indicate whether there is an incorrectly received downlink reference signal for the UE or whether a timer/counter corresponding to the one or more downlink reference signals is started.

12. The method of any one of claims 8 to 11, wherein the transmission status information of the one or more downlink reference signals comprises that at least one of the one or more downlink reference signals is not transmitted due to LBT failure.

13. The method according to any one of claims 8 to 12, further comprising:

and the base station sends configuration information to the UE, wherein the configuration information carries parameters used for updating timers/counters corresponding to one or more downlink reference signals.

14. An apparatus for transmitting control information, the apparatus comprising:

a sending module, configured to send report information to a base station, where the report information includes a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals; the detection result of the one or more downlink reference signals is used for informing the base station of the number of downlink reference signals which are not correctly detected by the UE or the downlink reference signals which are not correctly detected by the UE; the resources used for sending the report information correspond to the time-frequency resources used for transmitting the one or more downlink reference signals one to one;

a receiving module, configured to receive feedback information from the base station, where the feedback information includes transmission status information of the one or more downlink reference signals.

15. The apparatus of claim 14, wherein the sending module sends the report information to the base station when the UE does not detect at least one downlink reference signal or energy of at least one detected downlink reference signal is lower than a threshold value.

16. The apparatus according to claim 14 or 15, wherein the reporting information can be characterized in bitmap form or 1-bit information.

17. The apparatus of claim 16, wherein the 1-bit information is used to indicate whether there is an incorrectly received downlink reference signal for the UE, or whether a timer/counter corresponding to the one or more downlink reference signals is started.

18. The apparatus of any one of claims 14 to 17, wherein the transmission status information of the one or more downlink reference signals comprises that at least one of the one or more downlink reference signals is not transmitted due to LBT failure.

19. The apparatus of any one of claims 14 to 18, further comprising:

and the processing module is used for updating the timer/counter corresponding to the one or more downlink reference signals.

20. The apparatus of any one of claims 14 to 19,

the receiving module is further configured to receive configuration information from the base station, where the configuration information carries parameters used to update timers/counters corresponding to one or more downlink reference signals.

21. An apparatus for transmitting control information, the apparatus comprising:

a receiving module, configured to receive report information from a user equipment UE, where the report information includes a detection result of one or more downlink reference signals of the UE or a state of a timer/counter corresponding to the one or more downlink reference signals; the detection result of the one or more downlink reference signals is used for informing a base station of the number of downlink reference signals which are not correctly detected by the UE or the downlink reference signals which are not correctly detected by the UE; wherein, the resource for receiving the reported information is in one-to-one correspondence with the time frequency resource for transmitting the one or more downlink reference signals;

a sending module, configured to send feedback information to the UE, where the feedback information includes sending state information of the one or more downlink reference signals.

22. The apparatus of claim 21, wherein the receiving module receives the report information from the UE when the UE does not detect at least one downlink reference signal or energy of at least one detected downlink reference signal is lower than a threshold value.

23. The apparatus of claim 21 or 22, wherein the reporting information can be characterized in a bitmap form or 1-bit information.

24. The apparatus of claim 23, wherein the 1-bit information is used for indicating whether there is a downlink reference signal that is not correctly received by the UE, or whether a timer/counter corresponding to the one or more downlink reference signals is started.

25. The apparatus of any one of claims 21 to 24, wherein the transmission status information of the one or more downlink reference signals comprises that at least one of the one or more downlink reference signals is not transmitted due to LBT failure.

26. The apparatus of any one of claims 21 to 25,

the sending module is further configured to send configuration information to the UE, where the configuration information carries parameters used to update timers/counters corresponding to one or more downlink reference signals.